<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div id="app">
    <todo>
        <todo-title slot="todo-title" :title="title"></todo-title>
        <todo-items slot="todo-items" v-for="item in todoItems"
                    :item="item" v-bind:index="index" v-on:remove="removeItems(index)" :key="index"></todo-items>
    </todo>

</div>

<!--导入Vue.js-->

<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>

<script>
    Vue.component("todo", {
        template: '<div>\
        <slot name="todo-title"></slot>\
        <ul>\
        <slot name="todo-items"></slot>\
        </ul>\
        </div>'
    })
    Vue.component("todo-title", {
        props: ['title'],
        template: '<div>{{title}}</div>'
    });
    Vue.component("todo-items", {
        props: ['item', 'index'],
        template: '<li>{{index}}--{{item}}<button @click="remove">删除</button></li> ',
        methods: {
            remove: function (index) {
                this.$emit('remove', index);
            }
        }
    });

    var vm = new Vue({
        el: "#app",
        data: {
            title: "张三学系列课程",
            todoItems: ['张三学Java', '张三学前端', '张三学spring']
        },
        methods: {

            removeItems: function (index) {
                console.log("删除了" + this.todoItems[index] + "OK");
                this.todoItems.splice(index, 1);//一次删除一个元素


            }
        }

    });
</script>
</body>
</html>